Agree. He must have spent lots of time to adjust position and elevation. For example, using tracer ammo, so impact can be observed by standby helper(s) and feedback to him. Adjust little by little, then, finally, "bang" in show time.
Lots of effort. He fired a pistol like a cannon. But unlike indirect shooting from cannon, pistol does not have complex and accurate aiming device, aiming majorly depends on his skill and experience, so it's still amazing -- he's definitely very skillful.
When German put 1000m sight leaf on pistol, probably indirect shooting like this was in designer's mind.... God knows.
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